We present the results of a five-day monitoring campaign
with XMM-Newton of six X-ray bright young stellar objects (YSOs) in
the star-forming complex L1551 in Taurus. All stars present
significant variability on the five-day time scale. Modulation of
the light curve on time scales comparable with the star's rotational
period appeared to be present in the case of one weak-lined T Tauri
star. Significant spectral variations between the 2000 and the
2004 observations were detected in the (unresolved) classical T Tauri binary system XZ Tau: a hot plasma component which was present in the X-ray spectrum in 2000 had significantly weakened
in 2004. As XZ Tau N was undergoing a strong optical outburst in
2000, which had terminated since then, we speculate on the possible
relationship between episodic, burst accretion, and X-ray heating.
The transition object HL Tau underwent a strong flare with a complex
temperature evolution, which is indicative of an event confined within a very
large magnetic structure (few stellar radii), similar to the ones
found in YSOs in the Orion Nebula Cluster.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.